Air Systems Flashcards by Ryan Martin

COMPT TEMP digital readout with regards to PACKS?

PACKS will target temp for coldest COMPT (zone) and use TRIM AIR to regulate heat to other two zones.

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COMPT TEMP ZONE INOP light means?

S - SWITCH OFF

O - OVERHEAT (Duct)

F - FAULT (Controller)

T - TRIM AIR OFF

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Selecting TRIM AIR OFF does what?

Indications? Target Temp?

TRIM AIR VLV commanded to CLOSE.

All 4 compartment TEMP INOP lights illume.

Cabin auto temp controller will attempt to maintain 75F.

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RECIRC FAN purpose?

Reduce ENG BLEED AIR demand by recirculating recycled cabin air. 50% of cabin air is recirculated.

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RECIRC FAN locations?

L - Exhaust duct of FWD EE
R - AFT Cabin

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RECIRC FAN light Indications?

ON - Operating
INOP - OFF
BOTH - Failure or Inhibit*

_{*BOTH SHUT OFF w/ FWD or AFT CARGO FIRE ARMED switch pushed}

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What happens to PACKS with RECIRC FAN OFF?

Respective PACK will operate in HI FLOW

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PACK OFF Light indicates?

PACK VALVE is CLOSED

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3 reasons for PACK OFF light?

OFF
Pack Trip (Internal Overtemp)
Loss of air due to ENG BLD VLV closed

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3 reasons for PACK INOP light?

INOP LIGHT ONLY:

PACK OUTLET HI TEMP
PACK AUTO TEMP CONTROLLER FAIL

INOP + PACK OFF LIGHT:

PACK OVERHEAT

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PACK RESET switches reset what equip?

PACK TEMP CONTROLLER

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Will PACK continue operation with HI PACK OUTLET TEMP and what are indications?

Yes, but PTC will set full cold position.

INOP light illumes.

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Will PACK continue operation with internal PACK OVHT and what are indications?

No, the PACK will auto-shutdown

INOP light illumes
PACK valve closes
PACK OFF light

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Will PACK continue operation with AUTO TEMP CONTROLLER FAIL and what are indications?

YES, same as PACK HI OUTLET TEMP:

PACK continues operation
INOP light illumes.

^*^{Unlike HI TEMP OUTLET, the pack maintains existing position to maintain temp.}

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How can we tell if we’ve had HI PACK OUTLET TEMP vs AUTO TEMP CONTROLLER failure?

When STBY is selected:

INOP EXTINGUISH = AUTO TEMP CONT FAIL
*Reset is not available and manual mode is required.*

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PACK STBY Switch target temperatures?

C - 65F/18C
N - 75F/24C
W - 85F/29C

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When will a single PACK increase airflow (HI-FLOW)?

Opposite PACK is OFF
Respective RECIRC FAN is OFF
ON GROUND w/ APU or EXT AIR provided

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When is PACK HI-FLOW inhibited?

Inflight Single Engine Ops
AFT/CARGO FIRE ARM Pressed

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EE Config before start (below 7C)?

CLOSED LOOP

INBD SUPPLY VLV OPEN
EXHAUST VLV CLOSED
HEAT EXCH VALVE OPEN
BOTH FANS ON

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EE Config before start (above 7C)?

OPEN LOOP - VENT OVERBOARD

INBD SUPPLY VLV OPEN
EXHAUST VLV OPEN
HEAT EXCH VLV CLOSED
BOTH FANS ON

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EE Config after start?

INFLIGHT CLOSED LOOP CONFIG*

SUPPLY VLV CLOSED
BOTH FANS ON til Airborne
HEAT EXCH VLV OPEN

*Allows for the cabin to pressurize.

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EE VALVE light?

Any valve not in commanded position.

Select STBY–configures system to inside closed loop

IF light on after 30 sec, Overboard Exhaust Valve may be open

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EE OVHT light?

Study These Flashcards

LOW AIR/HI HEAT (Exhaust Fan FAIL)

Selector to STBY will energize SUPPLY FAN to re-establish airflow
OVHT light inhibited for 5 minutes

EE Switch to OVRD?

Study These Flashcards

OVHT light deactivated
NO COOLING light inhibited for 1 minute
All VLV + Fans deactivated except…
Manifold VLV opens to provide direct flow of conditioned air. Smoke/Override VLV provides exhaust path via differential pressure.

EE Panel SMOKE light?

* EE system SMOKE DETECTOR has detected smoke * Select OVRD as described above

EE NO COOLING light?

STBY BUS equipment reliable for 90 mins only Other equip may FAIL imminently ^{*light initially inhibited for 1 minute after selecting OVRD}

CARGO HEAT sources?

AFT/BULK - BODY DUCT FWD - CROSSFEED DUCT

CARGO HEAT ON/OFF? Target TEMP?

* OPENS/CLOSES respective SOV * Temp Auto maintained above 45F/7C

CARGO HEAT OVHT illumes when?

* Temp above 90F/32C * Associated valve CLOSES * EICAS CARGO OVHT

BULK CARGO HEAT to VENT?

* Required for carrying live animals in bulk compartment. * Raises TEMP to minimum 65F via FAN

How is CABIN ALTITUDE MODE selected? How is it powered?

Manually via switch on panel before every leg.\* * AUTO = AC * MANUAL = DC ^{*FO sets based on PM/PF}

CABIN ALT CONTROL AUTO RATE index mark?

500FPM CLIMB 300FPM DESCENT

At what altitude is max cabin differential pressure achieved?

FL350 (8.6PSI) *\*will maintain 8.6PSI for altitudes above*

When does PRESS system enter cruise mode?

When altitude remains constant for 1 minute.

The PRESS system maintains cruise mode until?

A climb or descent of more than 500'

When does pressurization system enter descent to LND ALT?

When a descent of 1,000' or more is initiated from cruise mode. *\*schedules LND at .0125psi*

What will re-establish PRESS cruise mode?

A level off of more than one minute

What happens if PRESS SYS1 or SYS2 fails?

Auto switching occurs without manual selection \*STATUS prompt on lower EICAS screen CABIN ALT AUTO 1/2

AUTO INOP light of PRESS system?

- Both auto modes have failed.\* or - MANUAL mode selected ^{*accompanying EICAS message "CABIN AUTO INOP"}

CABIN ALT light illumes? Extinguishes?

Above 10,000' cabin altitude Below 8,500' cabin altitude

OUTFLOW VALVE power source?

DC PWR

Will outflow valve auto close at 11,000' cabin altitude in AUTO and MANUAL modes?

YES ^{*but it's aircraft specific}

APU BLEED AIR available in flight?

Up to 17,000'

APU VALV Light?

Valve not in commanded position ## Footnote *\*normally in transit.*

L/R/C ISOLATION VLV normal config in flight?

* LEFT = CLOSED * RIGHT = CLOSED * C = (GUARDED) OPEN to supply C manifold with L/R air through check valves.

L/R DUCTS provide air to what systems?

* PACK * WING A/I * HYD RESERVOIR * ENG START VLV for APU and X-BLEED starts

C BODY DUCT provides air to what systems?

- C HYD ADP - AFT/BULK CARGO HEAT - C HYD RESERVOIR

C DUCT LEAK can't be isolated via switches, so what time limit must be observed for in-flight non-normal?

6 HRS

GROUND AIR operation and requirements?

* Connected directly at 2 inputs in L DUCT * Both connectors are required for adequate supply * All 3 isolation VLVs must be OPEN

DUCT LEAK light?

A HI TEMP bleed air leak is detected in the respective duct. There's a light for each.

Primary reason for BLEED panel light?

* PRV or HPSOV OPEN when should be CLOSED

OVHT light?

**Bleed air OVHT downstream pre-cooler** * ENG BLD VLV will auto-CLOSE * HPSOV will auto-CLOSE * PRV will auto-CLOSE * ENG A/I still available via PRV, if req'd

Engines are supplied air via _____ for normal starts?

APU ^{*even if opposite ENG running. Its BLD will be forced OFF for start.}

What equip is lost by isolating BODY DUCT LEAK?

Lose ADP so we lose HDG

Which electrical bus powers the outflow valve when in MANUAL mode?

Battery Bus

Air Systems Flashcards

(55 cards)